Screw-cap



r. G, WIELAND.

SCREW CAP. APPLICATION FILED FEB. 27.1919.

2 SHEETSSHEET lo mum W01,

Patented Jan. 6,1920.

r. e. WIELAND.

scazw cAP. APPLICATION FILED FEB. 27.19l9.

Patented Jan. 6,1920.

2 SHEETS-SHEET 2 v Elli? FREDERICK G. WIELAI'IID, OF BROOKLYN,

nnw YORK, Assnsnon T0 ANCHOR one a CLOSURE COR'POBJATION, 0E BROOKLYN, NEW YGRKpA CORPGREEIGN OF, NEW 1 I YORK. I. I

necessa- Toail'wh'om it may cmcccm: H I

Belt known that l, Fnnnnnion Gr. 'Wnt Lane, a citizen of the United States, residing at Brooklyn; in the county of Kings, State of tion.

This invention relates broadly to bottle and'jar closures and rnore specially to screw The principal ob ect of th s invention is to provide an exceptionally strong and stable closure of the screw cap type, suitable for use oncontainers hav ng either screw threads or inclined lugs, and Wherem thev is a screw cap of the character specified and therein the thread engaging lugs are formed adjacent the'wire or rolled edge of the cap and with the metal the lugs under coinpression insuch manner that the lugs are rigid and substantially non-yield- A still further and mportant ob ectof the present invention is a cap of the character specified wherein the thread engaging faces of the lugs are substantially at rightangles to the skirt of the cap and comprise metal under "compression forces and supported directly by the wire or rolled edge of the cap. 7 j f Another object ofmy invention is a screw cap which has excess metal in the skirt 'por:

tion compressed inwardly there-across to, form inwardly directed thread engag ng A further object is the provision of a cap as specified and wherein the edge of the cap is rolled adjacent the said lngsin' order to provide a supporting Wire edge effective to prevent stripping the lugs over the threads 7 on the container.

A still further object is the provision of a screw cap wherein excess metal is provided at intervals adjacent the lowen pertion of the skirt, and said excess metal cornpressed inwardly and partially froldedupon New York have invented certain new and useful Improvements in .fvorefiv- Caps, of which the tollowing 1s a specifica- Patented Janet's 119241 I Application filed. rebruar jer, ieie'. serial nof'z'z'sees,

itself to proyide inwardly extending'tiibih laripro'jections' which'reinitorcefthe skirt. 5 5 Another object of thepresen't invention It is a cap ot'jtl'ie character specified Whereinff projections are formed at suitable intervals aroiind thelowe'r edge of the cap from metal folded upon itself and'with the pro 66 ject ons comprising a portion contiguous .j to the inner edge of the wire vroll and'with out collapsing the-wire roll." V Other and further objects'of the present inventioi'rwil-l in, partbe obvious and will 1n pa1't 'be"poi'nted out hereinafter inj'the specification following by reference to the accompanying drawings forming a part of the application. i

Figure 1 is which the cap is formed andillnstrates the excess metal from which the thread en aging projections'are niade. I I o Fig. 2 is a perspective view showing the inside oftheb'lank'after it leaves the press which has formed the skirt of the cap. I Fig." 3is a more or less diagrainmatical v view of one 'i'orni or mechanism adaptable 'to form "the projections new the excess 'metal specified. i V F ig. c-is' a View illustrating thi insiole of the cap blank after it has left the inechag nisni illustrated in Fig/ 3', and shows the screw-threading projections after having heen completely formed, Fig.5 is afe'ct'ionoirline [AA-B of Fig; Fig. 6"is a jalalii' yiew"'looking at the in side of acompletely,finished cap."

Fig. 7 is asection taken on .line CeD of Fig.6. v T 9e 7 Fig. 8 is a perspective View showing the 'exter'ior'or' the completed cap. j Fig.9 is 'a ole tail sectional "view taken on line E -Fof 61 I Q f Heretofore inpthe artthere have [been three general forms of screw caps. The first has spiral threads in the skirt of the cap so that completefscrew threads are can ried by thec'ap. The other two forms of threadficaps. .One way of'makin this latter group hascomprisedtheindenting of the skirt or the cap at intervalsto provide lugs adapted to engage suitable threads on a con tainer'. quiclr-th read, type oi cap has comprised the a'yiewf of the blank fi'oinih" screw caps are of the sort known as quick- The other way of making the striking up of small lugs by bending inward the edge of the skirt. In some cases the raw edge of the skirt is bent inwardly, in other cases wire rolled edges are fiattened and bent inward.

The first type of screw cap specified 1s a satisfactory cap for many purposes but requires a longer time for the seating operation than does the quick-thread type cap. The quick-thread type caps heretofore mentioned are more or less unsightly because the striking up or bending in of the metal breaks the symmetry of the cap. F urthermore, the engaging lugs are so local in the transmision of forces to the skirt of the cap that it often happens in tightening such a cap the lugswill spring out and jump over or slip over the threads on the container so that a tight rigi seal cannot always be obtained by this type of cap.

The cap comprising the present invention is a quick-thread type cap wherein the lugs are formed from excess metal which is forced inwardly in such manner that the lugs are under compressive forces which resist any tendency to force the lug outwardly, particularly in View of the fact that the continuous smooth rolled edge extends immediately over and reinforces eachand all of the pro ections. By actual experiment it has been found substantially impossible to strip these projections over the container threads so that by means of this cap it is possible to provide a very tight effective closure. Since the wire or rolled edge of the cap is symmetrical and covers the inwardly extending lugs the cap presents a perfectly symmetrical and pleasing appearance.

This cap may be formed in various ways, but preferably is formed of ductile sheet material by punching and spinning operations.

Referring now to the drawings, in Fig. l is illustrated a form of blank 1 which is substantially circular with the exception ofextensions 2 which in the present case are located uniformly at 90 degrees around the periphery of the blank. In Fig. 2 the blank has been cupped to provide a cover portion which maycontain an ornamental bead 5. A skirt 6 is integral with and extends from the cover portion land carries the remainder of the blank which comprises the flange 7 It will be noted that the excess metal or extensions 2 are maintained in the flange at this time. -The operations illustrated in Figs. land 2 may be accomplished by a single stroke of a suitable press. The blank as shown in Fig. 2 may next be operated upon by a suitable spinning mechanism which may comprise a blank carrying head 8 having a shoulder 9 adapted to come adjacent the edge of the skirt, and a spinning head 10 adjacent which is a guide plate 11 and a second spinning head 12. A movable naz'msa 17. As the cap carrying head 8 is brought into engagement with the spinning heads 10 and 12 the edge of the flange 7 contacts with the spinning roll 12, and as the spinning rolls are yieldingly forced together the rota.- tion of these rolls and the pressure on the edge of the flange 7 gradually causes the excess metal to be driven inwardly and to loop upon itself as at 18 (Fig. The member 14: cooperates with the other spinning heads to shape the flange. Thecap thus formed has the substantially circular annular skirt portion with portions of the metal folded inwardly and outwardly across the lower margin thereof as is shown in Fig. 4, whereby the segmentally shaped thread engaging lugs 19 are formed upon the interior of the cap. The next operation rolls the flange 7 into a wire edge 20 which is con tinuous around the entire lower edge of the skirt. Preferably the side wall of the skirt is knurled as at 21 in order to provide suitable grips for applying or removing the cap.

In a cap of this construction the segmental lugs 19 may be made of sufficient length to operate effectively on containers having inclined lugs, and to operate also upon containers equipped with spiralthreads. The lugs, the metal therein having been shaped under compression, will be particularly I strong, and said lugs being of .tubular form, they will exercise a very material stiffening and strengthening influence on 'the cap across the areas where the seating pressure is applied. Moreover, the skirt is held against circumferential expansion by the bead 22, so that the lugs can not be stripped over the threads, and the appearance of the closure is symmetrical, unbroken, and pleas- 111g.

I claim 1. As an article of manufacture a bottle cap comprising a cover portion, a skirt depending from said COVGI portion, a threadengaging projection formed under compression adjacent the lower edge of the skirt, and a continuous rolled edge on the lower edge of the skirt and covering the said projection.

2. As an article of manufacturea bottle cap comprising a cover portion, a skirt depending from said cover portion, a concave inwardly extending thread engaging lug formed under compression adjacent the lower edge of the skirt, and a continuous rolled bead on the lower edge of the skirt and covering the concavity of said thread engaging lug on the exterior of the cap.

3. As an article of manufacture a closure cap comprlsing a cover portion, a skirt dependmg from said cover portion, and a locking projection comprising metal folded upon itself at the lower edge of the skirt portion and extending inwardly at substantially right angles to said skirt portion, the upper fold being integral with the skirt portion and the lower fold extending across the lower limit of the skirt portion.

4. As an article of manufacture a closure cap comprising a cover portion, a skirt depending from said cover portion, and a hollow segmental locking projection comprising metal folded upon itself at the lower edge of the skirt portion and with the upper side of the projection extending inwardly at substantially right angles to said skirt portion.

5. As an article of manufacture a closure cap comprising a cover portion, a skirt depending from said cover portion, and a plurality of lugs arranged at the lower edge of the said skirt portion comprising metal extending across the margin of the skirt and folded upon itself and rolled outwardly into a wire edge on the lower edge of the said skirt.

6. As an article of manufacture a. closure cap comprising a cover portion, a skirt depending from said cover portion, and a plurality of lugs arranged at the lower edge of the said skirt portion comprising' metal folded inwardly and outwardly across the skirt and with the lower 'fold of the said metal terminating in a wire edge located at the lower edge of the said skirt.

7. As an article of manufacture a closure cap comprising a cover portion, a skirt depending from said cover portion, and a plurality of closed tubular lugs at the lower edge of said skirt.

8. As an article of manufacture a closure cap comprising a cover portion, a skirt depending from said cover portion, a plurality of inwardly extending lugs of segmental form at the lower edge of said skirt, and a wire roll edge comprising'the free edge of the skirt and covering and supporting the said lugs whereby the lugs are invisible from the exterior of the cap when the cap is in position upon a suitable Vessel.

9. As an article of manufacture a closure cap comprising a cover portion, an annular skirt depending from said cover portion, a continuous smooth bead on the lower edge of said skirt, and projections extending in-.

wardly from said bead and comprising the metal folded upon itself and retained under compression by the head at substantially a right angle to the said skirt.

10. As an article of manufacture a closure cap comprising a cover portion, an annular skirt depending from said cover portion, a continuous smooth bead on the lower edge of said skirt, and projections extending inwardly from said head and comprising the metal folded upon itselfand at substantially a right angle to the said skirt, and with the metal in the lower fold under greater compression forces than the metal in the upper fold.

11. A closure cap of the character specified comprising a cover portion, an annular skirt depending from said cover portion, a plurality of lugs adjacent the edge of said skirt and comprising segments of metal folded upon itself and integral with ,the skirt throughout their length.

12. A closure cap of the character specified comprising a cover portion, an annular skirt depending from said cover portion, a plurality of lugs adjacent the edge of said skirt and comprising elongated segments of metal folded upon itself and compressed at substantially a right angle to the wall of the skirt and with the metal in the lower fold having greater compression than the metal in the upper fold.

13. A closure cap of the character specified comprising a cover portion, an annular skirt depending from said cover portion, a plurality of lugs comprising folds of metal extending inwardly on the lower edge of the said skirt portion and outwardly across the edge thereof, and a smooth rolled wire edge extending around the said skirt and comprising a support tending to resist forces against the inner edges of the said lugs.

14. A closure cap of the character specified comprising a cover portion, an annular skirt depending from said cover portion, a continuous annular bead formed at the lower margin of the skirt portion, a plurality of elongated thread engaging lugs extending substantially perpendicular to the skirt portion, each of said lugs comprising an upper fold connecting with the skirt portion and a lower fold connecting with the annular bead. 

